Mary, the tunnel boring machine that has been paving the way for the expanded Hampton Roads Bridge-Tunnel, hit a milestone Wednesday when she finished the first of twin tunnels that are part of the ...

The tunnel boring machine known as Chessie broke through the receiving pit on Two Island at the Thimble Shoal Channel at the Chesapeake Bay Bridge-Tunnel Monday, the ...

HAMPTON ROADS, Va. — The massive boring machine that's being used in the Hampton Roads Bridge-Tunnel expansion project reached a huge milestone. The machine, named "Mary," is digging the tunnel ...

Mary, the tunnel-boring machine, is on the move again! Thursday, Mary began boring a twin eastbound tunnel in part with the Hampton Roads Bridge-Tunnel Expansion Project. Watch: First of 4 ...

Here's how the tunnel boring machine, or TBM, works: As the 200-ton TBM moves forward, a round cutter head studded with titanium teeth grinds into the tunnel face and splits large chunks off the rock.

Burrowing of a new tunnel to help carry more vehicles between Virginia Beach and the Eastern Shore has resumed about 10 months after a gigantic boring machine struck an old ship anchor buried ...

While Mercury News readers dubbed the Santa Clara Valley Transportation Authority’s $76 million tunnel boring machine “Shai-Hulud,” after the sand worm creatures from “Dune,” the transit ...

In short: A tunnel boring machine in the Snowy 2.0 hydropower project has become wedged in hard rock and unable to move forward. It's the latest in a series of problems plaguing the $12 billion ...

On a flat, windswept green plain north of Hamburg in the state of Schleswig-Holstein, Germany, a Herrenknecht tunnel boring machine is now 200 meters deep into burrowing under the Elbe River estuary.